phantasm
Explanation
The Joke
The comic shows what appears to be a tense confrontation scene, with one character (possibly a warrior or adventurer) facing another near a dark, gnarled tree. The first character challenges: "How can I be sure you're really my brother and not just some phantasm set by the dark wizard to lure me to my death?" The other responds with a very specific, embarrassing personal memory: "When you were 8, you tried to stick the TV remote in your nose to see if you could eat through your nose so you could eat them that way." This is apparently convincing enough.
The first character then concedes: "You got me. I was 11 though, before we go on." This admission -- correcting the age upward from 8 to 11, making the story even more embarrassing -- serves as the real punchline. Rather than simply accepting the proof of identity, the character feels compelled to set the record straight, even though the correction makes them look worse.
The Humor
The joke operates on a classic fantasy/adventure trope: proving someone's identity by asking them something only the real person would know. But instead of a dignified secret or meaningful shared memory, the proof is a deeply embarrassing childhood story about trying to eat through one's nose. The extra twist of the character correcting the age from 8 to 11 is the comedic peak -- it shows that even in a life-or-death fantasy scenario, human vanity about trivial details persists. Being 11 and doing something that stupid is objectively worse than being 8, but the character cannot let an inaccuracy stand, priorities notwithstanding.